package com.yu.nio.bio;


import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;

/**
 * Created by xiaolongyu on 15/3/8.
 */
public class TimeClientHandle implements Runnable {

    private String host;
    private int port;
    private Selector selector;
    private SocketChannel socketChannel;
    private volatile boolean stop;

    public TimeClientHandle(String host, int port){
        this.host = host == null ? "127.0.0.1" : host;
        this.port = port;
        try {
            selector = Selector.open();
            socketChannel = SocketChannel.open();
            socketChannel.configureBlocking(false);
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
    }

    @Override
    public void run() {

        try {
            doConnect();
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }

        while(!stop){
            try {
                selector.select(1000);
                Set<SelectionKey> selectedKey = selector.selectedKeys();
                Iterator<SelectionKey> it = selectedKey.iterator();
                SelectionKey key = null;
                System.out.println("--->into handler 1");
                while(it.hasNext()){
                    key = it.next();
                    it.remove();
                    System.out.println("--->into handler 2");
                    handlerInput(key);
                }
            } catch (IOException e) {
                e.printStackTrace();
                System.exit(1);
            }
        }

        if(selector != null){
            try {
                selector.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    private void handlerInput(SelectionKey key) throws IOException {
        if(key.isValid()){
            SocketChannel sc = (SocketChannel)key.channel();
            if(key.isConnectable()){
                if(sc.finishConnect()){
                    sc.register(selector, SelectionKey.OP_READ);
                    doWrite(sc);
                } else {
                    System.exit(1);
                }
            }

            if(key.isReadable()){
                ByteBuffer readBuffer = ByteBuffer.allocate(1024);
                int readBytes = sc.read(readBuffer);
                if(readBytes > 0){
                    readBuffer.flip();
                    byte[] bytes = new byte[readBuffer.remaining()];
                    readBuffer.get(bytes);
                    String body = new String(bytes, "UTF-8");
                    System.out.println("Now is " + body);
                    this.stop = true;
                } else if(readBytes < 0){
                    key.cancel();
                    sc.close();
                } else {

                }

            }
        }

    }

    private void doConnect() throws IOException {
        if(socketChannel.connect(new InetSocketAddress(host, port))){
            socketChannel.register(selector, SelectionKey.OP_READ);
            doWrite(socketChannel);
        } else {
            socketChannel.register(selector, SelectionKey.OP_CONNECT);
        }

    }

    private void doWrite(SocketChannel sc) throws IOException {
        byte[] req = "QUERY TIME ORDER".getBytes();
        ByteBuffer writeBuffer = ByteBuffer.allocate(req.length);
        writeBuffer.put(req);
        writeBuffer.flip();
        sc.write(writeBuffer);
        if(!writeBuffer.hasRemaining()){
            System.out.println("Send order 2 server succeed.");
        }
    }

}
